Computes notions of knowledge structures.

1 | ```
knotions(x)
``` |

`x` |
An |

A *notion* is a set of items always jointly contained in some
knowledge states. Consequently, these items carry the same information
and may therefore be considered equivalent. A knowledge structure where
each notion contains only one item is considered discriminative.

A `set`

of sets, each representing one notion of the
knowledge structure.

Doignon, J.-P., Falmagne, J.-C. (1999) *Knowledge Spaces*. Heidelberg:
Springer Verlag.

`reduction.kstructure`

, `kstructure`

, `set`

1 2 3 | ```
kst <- kstructure(set(set("a"), set("a","b"), set("a","c"), set("d","e"),
set("a","b","d","e"), set("a","c","d","e"), set("a","b","c","d","e")))
knotions(kst)
``` |

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